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Wiktionary
precipitin

n. Any antibody that reacts with an antigen to form a precipitate.

WordNet
precipitin

n. an antibody that causes precipitation when it unites with its antigen

Wikipedia
Precipitin

A precipitin is an antibody which can precipitate out of a solution upon antigen binding.

Usage examples of "precipitin".

McReady held a test tube with white precipitin settling slowly from straw-colored serum.

McReady held a test-tube with white precipitin settling slowly from straw-colored serum.

Two minutes later, McReady held a test tube with white precipitin settling slowly from straw-colored serum.